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Structural organization of the A-1A, A-1B, PA, and PB pigments (A) and A-1B, PA, and PB pigments (B). PA and PB are shown in purple and A-1A in cyan. Structure obtained using UCSF Chimera software 1.17.3 utilizing the PSI crystal structure from S6803 (PDB file 5OY0 [25]) at 2.5 Å resolution. The backbone and side chain of Asn at A600 and B582 are also shown (black). Distances from the Asn carbonyl oxygen atoms (dashed lines) are shown (in Å). These distances are listed in Table 1.
